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Rocking-motion-induced charging of C60 on h-BN/Ni(111)


Muntwiler, M; Auwarter, W; Seitsonen, A P; Osterwalder, J; Greber, T (2005). Rocking-motion-induced charging of C60 on h-BN/Ni(111). Physical Review. B, Condensed Matter and Materials Physics, 71(12):121402.

Abstract

One monolayer Of C-60 on one monolayer of hexagonal boron nitride on nickel is investigated by photoemission. Between 150 and 250 K the work function decreases and the binding energy of the highest-occupied molecular orbital increases by \≈ 100 meV. In parallel, the occupancy of the-in the cold state almost empty-lowest unoccupied molecular orbital (LUMO) changes by 0.4\± 0.1 electrons. This charge redistribution is triggered by the onset of molecular rocking motion, i.e., by orientation dependent tunneling between the LUMO Of C-60 and the substrate. The magnitude of the charge transfer is large and cannot be explained within a single-particle picture. It is proposed to involve electron-phonon coupling where C-60(-) polaron formation leads to electron self-trapping.

Abstract

One monolayer Of C-60 on one monolayer of hexagonal boron nitride on nickel is investigated by photoemission. Between 150 and 250 K the work function decreases and the binding energy of the highest-occupied molecular orbital increases by \≈ 100 meV. In parallel, the occupancy of the-in the cold state almost empty-lowest unoccupied molecular orbital (LUMO) changes by 0.4\± 0.1 electrons. This charge redistribution is triggered by the onset of molecular rocking motion, i.e., by orientation dependent tunneling between the LUMO Of C-60 and the substrate. The magnitude of the charge transfer is large and cannot be explained within a single-particle picture. It is proposed to involve electron-phonon coupling where C-60(-) polaron formation leads to electron self-trapping.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:530 Physics
540 Chemistry
Language:English
Date:2005
Deposited On:26 Mar 2009 20:05
Last Modified:05 Apr 2016 12:27
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.71.121402

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